blender/io_mspgl/mesh.py

   1 import bpy
   2 import math
   3 import mathutils
   4
   5 def make_edge_key(i1, i2):
   6         return (min(i1, i2), max(i1, i2))
   7
   8 class Edge:
   9         def __init__(self, me):
  10                 if me.__class__==Edge:
  11                         self._medge = me._medge
  12                         self.vertices = me.vertices[:]
  13                         self.smooth = me.smooth
  14                 else:
  15                         self._medge = me
  16                         self.smooth = False
  17                 self.key = me.key
  18                 self.faces = []
  19
  20         def __getattr__(self, attr):
  21                 return getattr(self._medge, attr)
  22
  23         def check_smooth(self, limit):
  24                 if len(self.faces)!=2:
  25                         return
  26
  27                 d = self.faces[0].normal.dot(self.faces[1].normal)
  28                 self.smooth = ((d>limit and self.faces[0].use_smooth and self.faces[1].use_smooth) or d>0.99995)
  29
  30         def other_face(self, f):
  31                 if f.index==self.faces[0].index:
  32                         if len(self.faces)>=2:
  33                                 return self.faces[1]
  34                         else:
  35                                 return None
  36                 else:
  37                         return self.faces[0]
  38
  39         def other_vertex(self, v):
  40                 if v.index==self.vertices[0].index:
  41                         return self.vertices[1]
  42                 else:
  43                         return self.vertices[0]
  44
  45
  46 class Vertex:
  47         def __init__(self, mv):
  48                 if mv.__class__==Vertex:
  49                         self._mvert = mv._mvert
  50                         self.uvs = mv.uvs[:]
  51                         self.tan = mv.tan
  52                         self.bino = mv.bino
  53                 else:
  54                         self._mvert = mv
  55                         self.uvs = []
  56                         self.tan = None
  57                         self.bino = None
  58                 self.index = mv.index
  59                 self.co = mv.co
  60                 self.normal = mv.normal
  61                 self.flag = False
  62                 self.edges = []
  63                 self.faces = []
  64                 self.groups = mv.groups[:]
  65
  66         def __getattr__(self, attr):
  67                 return getattr(self._mvert, attr)
  68
  69         def __cmp__(self, other):
  70                 if other is None:
  71                         return 1
  72                 return cmp(self.index, other.index)
  73
  74
  75 class VertexGroup:
  76         def __init__(self, base):
  77                 self._base = base
  78                 self.group = base.group
  79                 self.weight = base.weight
  80
  81         def __getattr__(self, attr):
  82                 return getattr(self._mvert, attr)
  83
  84
  85 class Face:
  86         def __init__(self, mf):
  87                 self._mface = mf
  88                 self.index = mf.index
  89                 self.edges = []
  90                 self.vertices = mf.vertices[:]
  91                 self.uvs = []
  92                 self.flag = False
  93
  94         def __getattr__(self, attr):
  95                 return getattr(self._mface, attr)
  96
  97         def __cmp__(self, other):
  98                 if other is None:
  99                         return 1
 100                 return cmp(self.index, other.index)
 101
 102         def pivot_vertex(self, v):
 103                 n = self.vertices.index(v)
 104                 return [(n+i)%len(self.vertices) for i in range(len(self.vertices))]
 105
 106         def pivot_vertices(self, *vt):
 107                 flags = [(v in vt) for v in self.vertices]
 108                 l = len(self.vertices)
 109                 for i in range(l):
 110                         if flags[i] and not flags[(i+l-1)%l]:
 111                                 return self.vertices[i:]+self.vertices[:i]
 112
 113         def get_edge(self, v1, v2):
 114                 key = make_edge_key(v1.index, v2.index)
 115                 for e in self.edges:
 116                         if e.key==key:
 117                                 return e
 118                 raise KeyError("No edge %s"%(key,))
 119
 120         def other_edge(self, e, v):
 121                 for d in self.edges:
 122                         if d!=e and v in d.vertices:
 123                                 return d
 124
 125         def get_neighbors(self):
 126                 neighbors = [e.other_face(self) for e in self.edges]
 127                 return list(filter(bool, neighbors))
 128
 129
 130 class Line:
 131         def __init__(self, e):
 132                 self.edge = e
 133                 self.vertices = e.vertices[:]
 134                 self.flag = False
 135
 136
 137 class UvLayer:
 138         def __init__(self, arg):
 139                 if type(arg)==str:
 140                         self._layer = None
 141                         self.name = arg
 142                 else:
 143                         self._layer = arg
 144                         self.name = arg.name
 145                         self.uvs = [d.uv for d in self.data]
 146
 147                 self.unit = None
 148                 self.hidden = False
 149
 150                 dot = self.name.find('.')
 151                 if dot>=0:
 152                         ext = self.name[dot:]
 153                         if ext.startswith(".unit") and ext[5:].isdigit():
 154                                 self.unit = int(ext[5:])
 155                         elif ext==".hidden":
 156                                 self.hidden = True
 157
 158         def __getattr__(self, attr):
 159                 return getattr(self._layer, attr)
 160
 161
 162 class Mesh:
 163         def __init__(self, m):
 164                 self._mesh = m
 165
 166                 self.winding_test = m.winding_test
 167                 self.tbn_vecs = m.tbn_vecs
 168                 self.vertex_groups = m.vertex_groups
 169
 170                 self.vertices = [Vertex(v) for v in self.vertices]
 171                 self.faces = [Face(f) for f in self.polygons]
 172                 self.edges = [Edge(e) for e in self.edges]
 173                 self.loops = self.loops[:]
 174
 175                 self.materials = self.materials[:]
 176                 if self.use_uv=='NONE' or not self.uv_layers:
 177                         self.uv_layers = []
 178                 else:
 179                         self.uv_layers = [UvLayer(u) for u in self.uv_layers]
 180                         self.uv_layers = sorted([u for u in self.uv_layers if not u.hidden], key=(lambda u: (u.unit or 1000, u.name)))
 181
 182                         if self.use_uv=='UNIT0':
 183                                 self.uv_layers = [self.uv_layers[0]]
 184
 185                         next_unit = max((u.unit+1 for u in self.uv_layers if u.unit is not None), default=0)
 186                         for u in self.uv_layers:
 187                                 if not u.unit:
 188                                         u.unit = next_unit
 189                                         next_unit += 1
 190
 191                 for v in self.vertices:
 192                         v.groups = [VertexGroup(g) for g in v.groups]
 193
 194                 edge_map = {e.key: e for e in self.edges}
 195                 for f in self.faces:
 196                         if len(f.vertices)>4:
 197                                 raise ValueError("Ngons are not supported")
 198
 199                         f.vertices = [self.vertices[i] for i in f.vertices]
 200                         for v in f.vertices:
 201                                 v.faces.append(f)
 202
 203                         for k in f.edge_keys:
 204                                 e = edge_map[k]
 205                                 e.faces.append(f)
 206                                 f.edges.append(e)
 207
 208                 for e in self.edges:
 209                         e.vertices = [self.vertices[i] for i in e.vertices]
 210                         for v in e.vertices:
 211                                 v.edges.append(e)
 212
 213                 if self.use_lines:
 214                         self.lines = [Line(e) for e in self.edges if not e.faces]
 215                 else:
 216                         self.lines = []
 217
 218         def __getattr__(self, attr):
 219                 return getattr(self._mesh, attr)
 220
 221         def transform(self, matrix):
 222                 for v in self.vertices:
 223                         v.co = matrix*v.co
 224
 225         def splice(self, other):
 226                 if len(self.uv_layers)!=len(other.uv_layers):
 227                         raise ValueError("Meshes have incompatible UV layers")
 228                 for i, u in enumerate(self.uv_layers):
 229                         if u.name!=other.uv_layers[i].name:
 230                                 raise ValueError("Meshes have incompatible UV layers")
 231
 232                 material_map = []
 233                 for m in other.materials:
 234                         if m in self.materials:
 235                                 material_map.append(self.materials.index(m))
 236                         else:
 237                                 material_map.append(len(self.materials))
 238                                 self.materials.append(m)
 239
 240                 for i, u in enumerate(self.uv_layers):
 241                         u.uvs += other.uv_layers[i].uvs
 242
 243                 offset = len(self.vertices)
 244                 self.vertices += other.vertices
 245                 for v in self.vertices[offset:]:
 246                         v.index += offset
 247
 248                 loop_offset = len(self.loops)
 249                 self.loops += other.loops
 250
 251                 offset = len(self.faces)
 252                 self.faces += other.faces
 253                 for f in self.faces[offset:]:
 254                         f.index += offset
 255                         f.loop_start += loop_offset
 256                         f.loop_indices = range(f.loop_start, f.loop_start+f.loop_total)
 257                         if other.materials:
 258                                 f.material_index = material_map[f.material_index]
 259
 260                 offset = len(self.edges)
 261                 self.edges += other.edges
 262                 for e in self.edges[offset:]:
 263                         e.index += offset
 264                         e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 265
 266                 self.lines += other.lines
 267
 268         def prepare_smoothing(self, progress):
 269                 smooth_limit = -1
 270                 if self.smoothing=='NONE':
 271                         for f in self.faces:
 272                                 f.use_smooth = False
 273
 274                         smooth_limit = 1
 275                 elif self.use_auto_smooth:
 276                         smooth_limit = math.cos(self.auto_smooth_angle)
 277
 278                 for e in self.edges:
 279                         e.check_smooth(smooth_limit)
 280
 281                 progress.push_task("Sharp edges", 0.0, 0.7)
 282                 self.split_vertices(self.find_smooth_group, progress)
 283
 284                 if self.smoothing!='BLENDER':
 285                         progress.set_task("Updating normals", 0.7, 1.0)
 286                         self.compute_normals(progress)
 287
 288                 progress.pop_task()
 289
 290         def prepare_vertex_groups(self, obj):
 291                 for v in self.vertices:
 292                         if v.groups:
 293                                 weight_sum = sum(g.weight for g in v.groups)
 294                                 v.groups = sorted(v.groups, key=(lambda g: g.weight), reverse=True)[:self.max_groups_per_vertex]
 295                                 weight_scale = weight_sum/sum(g.weight for g in v.groups)
 296                                 for g in v.groups:
 297                                         g.weight *= weight_scale
 298
 299                 if obj.parent and obj.parent.type=="ARMATURE":
 300                         armature = obj.parent.data
 301                         bone_indices = {b.name: i for i, b in enumerate(armature.bones)}
 302                         group_index_map = {i: i for i in range(len(obj.vertex_groups))}
 303                         for g in first_obj.vertex_groups:
 304                                 if g.name in bone_indices:
 305                                         group_index_map[g.index] = bone_indices[g.name]
 306
 307                         for v in self.vertices:
 308                                 for g in v.groups:
 309                                         g.group = group_index_map[g.group]
 310
 311         def prepare_uv(self, obj, progress):
 312                 if obj.material_tex and self.use_uv!='NONE':
 313                         layer = UvLayer("material_tex")
 314
 315                         if self.use_uv=='UNIT0':
 316                                 self.uv_layers = [layer]
 317                                 layer.unit = 0
 318                         else:
 319                                 self.uv_layers.append(layer)
 320                                 layer.unit = max((u.unit+1 for u in self.uv_layers if u.unit is not None), default=0)
 321
 322                         layer.uvs = [None]*len(self.loops)
 323                         for f in self.faces:
 324                                 uv = mathutils.Vector(((f.material_index+0.5)/len(self.materials), 0.5))
 325                                 for i in f.loop_indices:
 326                                         layer.uvs[i] = uv
 327
 328                 array_uv_layers = [t.uv_layer for m in self.materials if m.array_atlas for t in m.texture_slots if t and t.texture_coords=='UV']
 329                 array_uv_layers = [u for u in self.uv_layers if u.name in array_uv_layers]
 330
 331                 if array_uv_layers:
 332                         for f in self.faces:
 333                                 layer = 0
 334                                 if f.material_index<len(self.materials):
 335                                         mat = self.materials[f.material_index]
 336                                         if mat and mat.array_atlas:
 337                                                 layer = mat.array_layer
 338
 339                                 for l in array_uv_layers:
 340                                         for i in f.loop_indices:
 341                                                 l.uvs[i] = mathutils.Vector((*l.uvs[i], layer))
 342
 343                 for f in self.faces:
 344                         for u in self.uv_layers:
 345                                 f.uvs.append([u.uvs[i] for i in f.loop_indices])
 346
 347                 prog_count = len(self.uv_layers)
 348                 prog_step = 0
 349
 350                 tbn_layer_index = -1
 351                 if self.tbn_vecs:
 352                         uv_names = [u.name for u in self.uv_layers]
 353                         if self.tbn_uvtex in uv_names:
 354                                 prog_count += 1
 355                                 tbn_layer_index = uv_names.index(self.tbn_uvtex)
 356                                 progress.push_task_slice("Computing TBN", 0, prog_count)
 357                                 self.split_vertices(self.find_uv_group, progress, tbn_layer_index)
 358                                 progress.set_task_slice(self.tbn_uvtex, 1, prog_count)
 359                                 self.compute_tbn(tbn_layer_index, progress)
 360                                 progress.pop_task()
 361                                 prog_step = 2
 362
 363                 for i, u in enumerate(self.uv_layers):
 364                         if i==tbn_layer_index:
 365                                 continue
 366
 367                         progress.push_task_slice(u.name, prog_step, prog_count)
 368                         self.split_vertices(self.find_uv_group, progress, i)
 369                         progress.pop_task()
 370                         prog_step += 1
 371
 372                 for v in self.vertices:
 373                         if v.faces:
 374                                 f = v.faces[0]
 375                                 i = f.vertices.index(v)
 376                                 v.uvs = [u[i] for u in f.uvs]
 377                         else:
 378                                 v.uvs = [(0.0, 0.0)]*len(self.uv_layers)
 379
 380         def split_vertices(self, find_group_func, progress, *args):
 381                 groups = []
 382                 for i in range(len(self.vertices)):
 383                         v = self.vertices[i]
 384                         for f in v.faces:
 385                                 f.flag = False
 386
 387                         vg = []
 388                         for f in v.faces:
 389                                 if not f.flag:
 390                                         vg.append(find_group_func(v, f, *args))
 391
 392                         groups.append(vg)
 393
 394                         progress.set_progress(i*0.5/len(self.vertices))
 395
 396                 for i in range(len(self.vertices)):
 397                         for g in groups[i][1:]:
 398                                 v = Vertex(self.vertices[i])
 399                                 v.index = len(self.vertices)
 400                                 self.vertices.append(v)
 401
 402                                 v_edges = []
 403                                 for e in self.vertices[i].edges:
 404                                         e_faces_in_g = [f for f in e.faces if f in g]
 405                                         if e_faces_in_g:
 406                                                 boundary = len(e_faces_in_g)<len(e.faces)
 407                                                 v_edges.append((e, boundary, e_faces_in_g))
 408
 409                                 for e, boundary, e_faces_in_g in v_edges:
 410                                         if boundary:
 411                                                 ne = Edge(e)
 412                                                 ne.index = len(self.edges)
 413                                                 self.edges.append(ne)
 414
 415                                                 ne.other_vertex(self.vertices[i]).edges.append(ne)
 416
 417                                                 for f in e_faces_in_g:
 418                                                         e.faces.remove(f)
 419                                                         f.edges[f.edges.index(e)] = ne
 420                                                         ne.faces.append(f)
 421                                                 e = ne
 422                                         else:
 423                                                 self.vertices[i].edges.remove(e)
 424
 425                                         e.vertices[e.vertices.index(self.vertices[i])] = v
 426                                         v.edges.append(e)
 427
 428                                         e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 429
 430                                 for f in g:
 431                                         self.vertices[i].faces.remove(f)
 432                                         f.vertices[f.vertices.index(self.vertices[i])] = v
 433                                         v.faces.append(f)
 434
 435                         progress.set_progress(0.5+i*0.5/len(self.vertices))
 436
 437         def find_smooth_group(self, vertex, face):
 438                 face.flag = True
 439
 440                 edges = [e for e in face.edges if vertex in e.vertices]
 441
 442                 group = [face]
 443                 for e in edges:
 444                         f = face
 445                         while e.smooth:
 446                                 f = e.other_face(f)
 447                                 if not f or f.flag:
 448                                         break
 449
 450                                 f.flag = True
 451                                 group.append(f)
 452                                 e = f.other_edge(e, vertex)
 453
 454                 return group
 455
 456         def find_uv_group(self, vertex, face, index):
 457                 uv = face.uvs[index][face.vertices.index(vertex)]
 458                 face.flag = True
 459
 460                 group = [face]
 461                 for f in vertex.faces:
 462                         if not f.flag and f.uvs[index][f.vertices.index(vertex)]==uv:
 463                                 f.flag = True
 464                                 group.append(f)
 465
 466                 return group
 467
 468         def compute_normals(self, progress):
 469                 for i, v in enumerate(self.vertices):
 470                         v.normal = mathutils.Vector()
 471                         for f in v.faces:
 472                                 fv = f.pivot_vertices(v)
 473                                 edge1 = fv[1].co-fv[0].co
 474                                 edge2 = fv[-1].co-fv[0].co
 475                                 if edge1.length and edge2.length:
 476                                         v.normal += f.normal*edge1.angle(edge2)
 477
 478                         if v.normal.length:
 479                                 v.normal.normalize()
 480                         else:
 481                                 v.normal = mathutils.Vector((0, 0, 1))
 482
 483                         progress.set_progress(i/len(self.vertices))
 484
 485         def compute_tbn(self, index, progress):
 486                 layer_uvs = self.uv_layers[index].uvs
 487
 488                 for i, v in enumerate(self.vertices):
 489                         v.tan = mathutils.Vector()
 490                         v.bino = mathutils.Vector()
 491                         for f in v.faces:
 492                                 vi = f.pivot_vertex(v)
 493                                 uv0 = layer_uvs[f.loop_indices[vi[0]]]
 494                                 uv1 = layer_uvs[f.loop_indices[vi[1]]]
 495                                 uv2 = layer_uvs[f.loop_indices[vi[-1]]]
 496                                 du1 = uv1[0]-uv0[0]
 497                                 du2 = uv2[0]-uv0[0]
 498                                 dv1 = uv1[1]-uv0[1]
 499                                 dv2 = uv2[1]-uv0[1]
 500                                 edge1 = f.vertices[vi[1]].co-f.vertices[vi[0]].co
 501                                 edge2 = f.vertices[vi[-1]].co-f.vertices[vi[0]].co
 502                                 div = (du1*dv2-du2*dv1)
 503                                 if div:
 504                                         mul = edge1.angle(edge2)/div
 505                                         v.tan += (edge1*dv2-edge2*dv1)*mul
 506                                         v.bino += (edge2*du1-edge1*du2)*mul
 507
 508                         if v.tan.length:
 509                                 v.tan.normalize()
 510                         if v.bino.length:
 511                                 v.bino.normalize()
 512
 513                         progress.set_progress(i/len(self.vertices))
 514
 515         def drop_references(self):
 516                 for v in self.vertices:
 517                         v._mvert = None
 518                         for g in v.groups:
 519                                 g._base = None
 520                 for e in self.edges:
 521                         e._medge = None
 522                 for f in self.faces:
 523                         f._mface = None
 524                 for u in self.uv_layers:
 525                         u._layer = None
 526                 self._mesh = None
 527
 528         def create_strip(self, face, max_len):
 529                 # Find an edge with another unused face next to it
 530                 edge = None
 531                 for e in face.edges:
 532                         other = e.other_face(face)
 533                         if other and not other.flag:
 534                                 edge = e
 535                                 break
 536
 537                 if not edge:
 538                         return None
 539
 540                 # Add initial vertices so that we'll complete the edge on the first
 541                 # iteration
 542                 vertices = face.pivot_vertices(*edge.vertices)
 543                 if len(vertices)==3:
 544                         result = [vertices[-1], vertices[0]]
 545                 else:
 546                         result = [vertices[-2], vertices[-1]]
 547
 548                 while 1:
 549                         face.flag = True
 550
 551                         vertices = face.pivot_vertices(*result[-2:])
 552                         k = len(result)%2
 553
 554                         # Quads need special handling because the winding of every other
 555                         # triangle in the strip is reversed
 556                         if len(vertices)==4 and not k:
 557                                 result.append(vertices[3])
 558                         result.append(vertices[2])
 559                         if len(vertices)==4 and k:
 560                                 result.append(vertices[3])
 561
 562                         if len(result)>=max_len:
 563                                 break
 564
 565                         # Hop over the last edge
 566                         edge = face.get_edge(*result[-2:])
 567                         face = edge.other_face(face)
 568                         if not face or face.flag:
 569                                 break
 570
 571                 return result
 572
 573 def create_mesh_from_object(context, obj, progress):
 574         if obj.type!="MESH":
 575                 raise Exception("Object is not a mesh")
 576
 577         progress.push_task("Preparing mesh", 0.0, 0.3)
 578
 579         objs = [(obj, mathutils.Matrix())]
 580         i = 0
 581         while i<len(objs):
 582                 o, m = objs[i]
 583                 i += 1
 584                 for c in o.children:
 585                         if c.type=="MESH" and c.compound:
 586                                 objs.append((c, m*c.matrix_local))
 587
 588         mesh = None
 589         bmeshes = []
 590         for o, m in objs:
 591                 bmesh = o.to_mesh(context.scene, True, "PREVIEW")
 592                 bmeshes.append(bmesh)
 593
 594                 # Object.to_mesh does not copy custom properties
 595                 bmesh.winding_test = o.data.winding_test
 596                 bmesh.smoothing = o.data.smoothing
 597                 bmesh.use_lines = o.data.use_lines
 598                 bmesh.vertex_groups = o.data.vertex_groups
 599                 bmesh.max_groups_per_vertex = o.data.max_groups_per_vertex
 600                 bmesh.use_uv = o.data.use_uv
 601                 bmesh.tbn_vecs = o.data.tbn_vecs
 602                 bmesh.tbn_uvtex = o.data.tbn_uvtex
 603
 604                 me = Mesh(bmesh)
 605                 me.transform(m)
 606
 607                 if mesh:
 608                         mesh.splice(me)
 609                 else:
 610                         mesh = me
 611
 612         progress.set_task("Smoothing", 0.3, 0.6)
 613         mesh.prepare_smoothing(progress)
 614         progress.set_task("Vertex groups", 0.6, 0.7)
 615         mesh.prepare_vertex_groups(obj)
 616         progress.set_task("Preparing UVs", 0.7, 1.0)
 617         mesh.prepare_uv(obj, progress)
 618
 619         mesh.drop_references()
 620         for m in bmeshes:
 621                 bpy.data.meshes.remove(m)
 622
 623         progress.pop_task()
 624
 625         return mesh